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7. Investigation of the adsorption properties of U(VI) by sulfonic acid-functionalized carbon materials

Author

Yan Liu, Chao Jiang, Bao Yunyun, Changfu Wang, and Jinbiao Liu

Subjects
chemistry.chemical_classification, Carbonization, Chemistry, Health, Toxicology and Mutagenesis, Inorganic chemistry, Public Health, Environmental and Occupational Health, chemistry.chemical_element, Langmuir adsorption model, Sulfonic acid, Uranyl, Pollution, Endothermic process, Analytical Chemistry, symbols.namesake, chemistry.chemical_compound, Adsorption, Nuclear Energy and Engineering, symbols, Radiology, Nuclear Medicine and imaging, Fourier transform infrared spectroscopy, Carbon, Spectroscopy
Abstract

In this study, sulfonic acid-functionalized carbon materials (CS-SO3H) was carbonized and functionalized by polyphosphazene (PZS). The morphology and structure were characterized by FTIR, XPS and SEM. The influences of pH, contact time, initial concentration and temperature of CS-SO3H for uranyl ions were investigated. Results indicated that the adsorption equilibrium time was about 20 min. The adsorption process was more consistent with the Langmuir isotherm and the pseudo-second-order model. In addition, the maximum adsorption capacity of CS-SO3H was about 341.98 mg/g. Moreover, the thermodynamic parameters of ΔG, ΔH and ΔS show that the uranium adsorption process was spontaneous and endothermic.

Published
2021

8. Enhanced adsorption behavior of U(VI) using PZSC/ZnO ceramic composite derived from polyphosphazene.

Author

Bao, Yunyun, Liu, Yan, Wang, Changfu, Wang, Yun, Yuan, Dingzhong, Zhu, Zuqing, Xu, Jianda, and Liu, Jinbiao

Subjects
*X-ray emission spectroscopy, *FOURIER transform infrared spectroscopy, *X-ray photoelectron spectroscopy, *ADSORPTION (Chemistry), *ZINC oxide, *ADSORPTION capacity
Abstract

In this study, a new type of ceramic composite (PZSC/ZnO) was successfully synthesized using N, P, and S co‐doped carbon microspheres derived from polyphosphazene with zinc oxide. The morphology and structure were characterized by Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy, scanning electron microscopy, energy‐dispersive spectroscopy, Raman, X‐ray diffraction, BET, and thermogravimetric. Batch experiments were used to explore the adsorption performance under different pH values, initial concentrations, contact times, and temperatures. The results showed that the maximum adsorption capacity of the PZSC/ZnO ceramic composite for uranium was 470.5 mg/g (pH = 5.5, t = 40 min, and T = 25°C). The adsorption process followed the nonlinear Langmuir model and the pseudo‐second‐order kinetic model, demonstrating that the monolayered combination of U(VI) with the PZSC/ZnO ceramic composite and the adsorption mechanism was chemical adsorption. Thermodynamic data revealed that the adsorption was a spontaneous endothermic process. Furthermore, P and N may be involved in the adsorption of uranyl ions through binding to the O atoms from ZnO. The main forces between U(VI) and the PZSC/ZnO ceramic composite were attributed to ZnO and heteroatoms doped in the material. [ABSTRACT FROM AUTHOR]

Published
2023
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